Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...255..191b&link_type=abstract
Astrophysical Journal, Part 1, vol. 255, Apr. 1, 1982, p. 191-199.
Astronomy and Astrophysics
Astrophysics
31
A Stars, F Stars, Hot Stars, Stellar Spectrophotometry, Stellar Temperature, Ultraviolet Spectra, Visible Spectrum, Convection, Curve Fitting, Radiant Flux Density, Stellar Models
Scientific paper
Effective temperatures of late A and early F stars are determined from the observed fluxes in the visual at 1900 A and 1420 A. The observed ratios are compared with those calculated by Kurucz (1979). A correction of the theoretical fluxes at 1900 A brings the effective temperatures obtained from different ratios into reasonable agreement. The effective temperatures determined in this way for late A stars agree well with those obtained from the optical region. For F stars, however, the effective temperatures obtained from the UV are found to be higher than those obtained from the optical region if radiative equilibrium models are used for the comparison. It is thought that this discrepancy may derive from the effects of temperature, pressure, and absorption coefficient inhomogeneities caused by convection.
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